$A9/169: RS232 Flag: Start Bit check/Tape temporary
Kernal-Reference:
BIT $00A9 : $AC0C $E167
DEC $A9 : $F997
INC $A9 : $F993 $FBEC
LDA $A9 : $F9EB $FBE3
LDX $A9 : $EF59
ORA $A9 : $FA59
STA $A9 : $EF89 $FBA3
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